arduino/libraries/DallasTemperature/examples/WaitForConversion2/WaitForConversion2.pde

81 lines
2.1 KiB
Plaintext

//
// Sample of using Async reading of Dallas Temperature Sensors
//
#include <OneWire.h>
#include <DallasTemperature.h>
// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 2
// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);
DeviceAddress tempDeviceAddress;
int resolution = 12;
unsigned long lastTempRequest = 0;
int delayInMillis = 0;
float temperature = 0.0;
int idle = 0;
//
// SETUP
//
void setup(void)
{
Serial.begin(115200);
Serial.println("Dallas Temperature Control Library - Async Demo");
Serial.print("Library Version: ");
Serial.println(DALLASTEMPLIBVERSION);
Serial.println("\n");
sensors.begin();
sensors.getAddress(tempDeviceAddress, 0);
sensors.setResolution(tempDeviceAddress, resolution);
sensors.setWaitForConversion(false);
sensors.requestTemperatures();
delayInMillis = 750 / (1 << (12 - resolution));
lastTempRequest = millis();
pinMode(13, OUTPUT);
}
void loop(void)
{
if (millis() - lastTempRequest >= delayInMillis) // waited long enough??
{
digitalWrite(13, LOW);
Serial.print(" Temperature: ");
temperature = sensors.getTempCByIndex(0);
Serial.println(temperature, resolution - 8);
Serial.print(" Resolution: ");
Serial.println(resolution);
Serial.print("Idle counter: ");
Serial.println(idle);
Serial.println();
idle = 0;
// immediately after fetching the temperature we request a new sample
// in the async modus
// for the demo we let the resolution change to show differences
resolution++;
if (resolution > 12) resolution = 9;
sensors.setResolution(tempDeviceAddress, resolution);
sensors.requestTemperatures();
delayInMillis = 750 / (1 << (12 - resolution));
lastTempRequest = millis();
}
digitalWrite(13, HIGH);
// we can do usefull things here
// for the demo we just count the idle time in millis
delay(1);
idle++;
}